[TurboDave]

Originally Posted by UNGN

DFW use E10 during Ozone months and my mileage drops about 10% in my Neon: 32-33 mpg to 29 mpg. You will most definately notice it if you closely track your gas mileage.

I don't run the AC in the summer (my work is freezing so I use the 17 mile drive to thaw out) so I know the mileage difference purely from the fuel.

You definately should NOT be suffering 10% loss of mileage just because of E10. It's been under some pretty tough studies as of late, and has been determined that a slim mix like E10 should have very little (1 - 3% or less) or no affect on mileage. Mixes of E20-E30 have actually shown mileage improvements. E85 on the other hand, the mileage figures go back into the negative column by as much as 10-20%.